public Node Optional <T>(T category, SingleNodeCallback onSuccess, bool expect = false)
{
if (Has(category))
{
if (expect)
{
Expect(category);
}
return(onSuccess());
}
return(null);
}
// Rename to the actual name of this concept when I remember what was it
public Node LeftJoin<T>(Node leftmostNode, T category, SingleNodeCallback nextNodeCallback)
{
var lastNode = leftmostNode;
while (Has(category))
{
var node = Node.fromToken(Expect(category));
node.Add(lastNode);
node.Add(nextNodeCallback());
lastNode = node;
}
return lastNode;
}
public List<Node> ZeroOrMore<T>(T category, SingleNodeCallback onSuccess, bool expect = false)
{
var result_nodes = new List<Node>();
while (Has(category))
{
if (expect)
{
Expect(category);
}
result_nodes.Add(onSuccess());
}
return result_nodes;
}
